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Help.

NotSoSmart  Oct 31, 2017
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 #1
avatar+78729 
+1

In the form

 

y = a ( x + h)  + ( - k )   the vertex is  ( -h , -k)

 

So...we have

 

y = 3(x + 2)^2  + ( - 3 )

 

So....the vertex  is ( -2, -3)

 

Only one answer fits.....the second one

 

 

 

y = 2(x - 3)^2 +   (-  4 )

 

Because the "2" out front is positive, this parabola turns upward.......the vertex  is  (3, -4)

 

So....this is the minimum point on the parabola.....and y =  -4  is the minimum

The domain is all real numbers  [  we can put any x value into the function ]

And the range is  [ -4, infinity]   ⇒ all real numbers ≥ 4

 

The first answer is correct

 

This graph will help you see this :

 

https://www.desmos.com/calculator/cmyimyjq0h

 

 

 

cool cool cool

CPhill  Oct 31, 2017

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